for

for

#include <stdio.h>
int main()
{
    int n, count, sum = 0;

    printf("Enter a positive integer: ");
    scanf("%d", &n);

    // for loop terminates when n is less than count
    for(count = 1; count <= n; ++count)
    {
        sum += count;
    }

    printf("Sum = %d\n", sum);

    return 0;
}

결과

gcc -o loop loop.c

hacker@HACKER:~/c$ ./loop
Enter a positive integer: 10
Sum = 55